Various test performed to identify two bacterium that were unknown, one was plaque that were scrapped from the teeth and the second was an unknown given. It resulted that the unknown bacterium is Staphylococcus epidermidis. Staphylococcus epidermidis has three drug resistance, and no secondary metabolites. The plaque scrapped from the teeth had a morphology of bacilli and is gram positive. Staphylococcus is gram positive, it is catalase positive and oxidase negative. The minimal inhibition concentration of Ethanol extract is 0.001 micro liters for S. epidermidis. The minimal inhibition concentration for the plaque was at a concentration 0.1 ml of ethanol extract and a concentration of 0.01 ml for distilled water. Background: Staphylococcus …show more content…
Oxidase Test: Using a sterilized loop inoculate a loopful of bacteria into the test square and observe for any change in color. If it turns blue it is oxidase positive, and if it remains the same color then it is oxidase negative. Streaking: Using the method of quadrant streak a loopful of bacteria onto one side of the BHI agar plate and sterilize your loop. Then using the sterilized loop, grab one end of the side where it was previously streaked and slide it across on another side of the agar plate. Then using the sterilized loop grab the one end of that same side where it was previously streaked and slide it to the other corner of the agar plate. Sterilized your loop again using the flame and grab the last end of the previously streaked and streak the last corner of the agar plate. This should have four corners the fourth corner being the most diluent will have the most isolated colony forming. Dilution series: Use microcentrifuge tubes for the dilutions, if the final dilution is 10x^4 , you will need 5 microcentrifuge. Label the one as the stock, 10X, 10X^2, 10X^3 and 10X^4, then add 1 ml of the diluent X. Add .9 ml of the diluent to each concentration microcentrifuge and 0.1 ml of the substance that will be diluted on to the first microcentrifuge which is the one labeled as 10X, using the micropipette. Then add 0.1 ml of from the 10X microcentrifuge onto the 10X^2 microcentrifuge and so on until you reach
Add RO water to the 25 ml volumetric flask up to the mark. Put stopper on the flask and shake it properly.
Again, label 7 1.5ml tubes 0 thru 6. Place 15μl of each serially diluted extract into its corresponding labeled tube. Next add 465μl of media into each tube. Then 60μl of Alamar blue in each tube. Finally add an additional 60μl of cells (adjusted to 10,000 cells/20 μl). Vortex each tube for 5 seconds. Now, take 3 different samples 190μl samples of concentration 0 and put it in Wells A2, B2, and C2. Repeat this step again by taking 3 more different 190μl samples of concentration 1 and putting it in wells A3, B3, C3. It should be noted that it is important to vortex each 1.5μl tube again be-fore putting it into the 96 well plate. Contin-ue this same procedure consecutively for the re-maining concentrations.
After added, pick up the beaker and swirl it around lightly for a short period of time.
Purpose: To learn about the international system of units (SI), to become familiar with common lab equipment and techniques, to gain proficiency in determining volume, mass, length, and temperature of a variety of items using common laboratory measurement devices, to learn to combine units to determine density and concentration, and to use laboratory equipment to create serial dilutions and determine the density and concentration of each dilution.
11. During the 10 minutes, get the LB agar and LB+AMP agar plates ready. Mark your plates with the transformation tube mixture to use (+ or -), the lab group names, and the date on the top of the dishes.
H. How would you prepare 10 mL of a 0.25M HCl solution if 1M HCl was available? How much
Hold the inoculating loop still, move the broth culture tube up until the loop is within the
The 1 mL was then added to 9mL springwater to create the first 10 mL solution of 10 mM. The next group took 1 mL from this solution and dilute it further in 9 mL of water. This process continued for each group after. Each group took 1 mL from the previous solution until all of the concentrations were
This lab consisted of two parts over a span of three days. For part one on day one, we first began by determining the number of dilution that will be performed, and what the final dilution is going to be. My lab partner and I then disinfected our work bench to begin our procedure. To begin, using a filtered tip, we pipetted 900µL of sterile water into a labeled microcentrifuge tube for our 1:10 dilution. We then continued to keep diluting the tubes until we reached our final 1:1 dilution. We then vortexed our working stock for approximately 5 seconds and used a pipet to take 100 µL of the working stock solution to eject it into our first dilution microcentrifuge tube that contained 900 µL of sterile water. My lab partner and I used the same pipet to take out 100 µL of the first dilution to our next dilution that contained 900 µL of sterile water.
Begin by inserting a cheesecloth into a syringe and pressing the cheesecloth to the very bottom of the column.
Use the cotton swab to streak the five labeled nutrient agar plates with the E. Coli K12 bacteria from the tube.
Re-flame the neck of the bottle and place the top on. Place the disc on section 1A of the agar plate. 3. Repeat step 2 for the rest of the petri dishes (1B, 1C, and so on) 4. Place the petri dish 1 in the incubator at a temperature of 50 degrees Celsius, and leave for 24 hours exactly.
from one end and put the other end into a beaker full of iron filings,
TRIAL 2: 1) Repeat step 1 to step three from trial 1. 2) Pour 60mL in the centre of the
The LB/Amp/ara, and one of the LB/Amp plates marked with a “+” are the experimental plates.